<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/cat.jpg" alt />
      </div>
      <!-- 登录表单区 v-bind:model简写为：:model -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoinForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456"
      },
      // 表单校验规则对象
      loginFormRules: {
        //验证用户名是否合法规则数组
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          { min: 3, max: 10, message: "长度在 3 到 10 个字符", trigger: "blur" }
        ],
        //验证密码是否合法规则数组
        password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          { min: 6, max: 15, message: "长度在 6 到 15 个字符", trigger: "blur" }
        ]
      }
    };
  },
  methods: {
    //   点击重置按钮，重置登陆表单
    resetLoinForm() {
      //console.log(this);
      this.$refs.loginFormRef.resetFields();
    },
    login() {
        // 表单的validate()函数可以进行预验证
        //验证结果表现在回调函数的形参上，即valid
        //valid=>{}是一个简写的函数，等价于(valid)=>{}
      this.$refs.loginFormRef.validate(valid => {
        // 验证失败直接返回
        if(!valid) return;
        // 验证通过，通过axios发送登录请求，并通过then()函数中指定回调函数得到请求结果，即response
        this.$http.post('login',this.loginForm).then(response => {
          var result = response.data;
          // console.log(response);
          if(result.meta.status !== 200) return this.$message.error('登陆失败');
          // 使用elementui中的message组件进行弹框
          this.$message.success('登陆成功');
          // 将token存到会话期间的存储位置sessionStorage中
          window.sessionStorage.setItem('token', result.data.token);
          // 通过router编程式路由进行页面跳转
          this.$router.push('/home');
        });
      });
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  // 圆角边框
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      height: 100%;
      width: 100%;
      border-radius: 50%;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
